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Correct FS3880 guidance for unsupported language versions - #20795

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fix/issue-20666
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Correct FS3880 guidance for unsupported language versions#20795
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fix/issue-20666

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@T-Gro

@T-Gro T-Gro commented Oct 16, 2026 •
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Fixes #20666

Identify .NET SDK 10.0.1xx as the last compatible SDK feature band in compiler and F# Interactive diagnostics for out-of-support language versions.

Description

Language-version support is unchanged.

Checklist

  • Test cases added

  • Performance benchmarks added in case of performance changes

  • Release notes entry updated:

    Please make sure to add an entry with short succinct description of the change as well as link to this pull request to the respective release notes file, if applicable.

    Release notes files:

    • If anything under src/Compiler has been changed, please make sure to make an entry in docs/release-notes/.FSharp.Compiler.Service/<version>.md, where <version> is usually "highest" one, e.g. 42.8.200
    • If language feature was added (i.e. LanguageFeatures.fsi was changed), please add it to docs/release-notes/.Language/preview.md
    • If a change to FSharp.Core was made, please make sure to edit docs/release-notes/.FSharp.Core/<version>.md where version is "highest" one, e.g. 8.0.200.

    Information about the release notes entries format can be found in the documentation.
    Example:

    If you believe that release notes are not necessary for this PR, please add NO_RELEASE_NOTES label to the pull request.

Fix FS3880 SDK feature-band guidance
ece71f7 
Identify .NET SDK 10.0.1xx as the last compatible feature band while preserving the download URL and language-version support policy. Cover rejected version spellings and supported selectors in FSC and real FSI startup, and synchronize localization and release notes.

Fixes #20666

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
@T-Gro
T-Gro requested a review from a team as a code owner October 16, 2026 13:27
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github-actions Bot commented Oct 16, 2026 •
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✅ Release notes checked

✅ Found changes and release notes in following paths:

Change path Release notes path Description
`src/Compiler` docs/release-notes/.FSharp.Compiler.Service/11.0.200.md

Add release notes
b414c3d 
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

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.NET SDK >= 10.0.200

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